RU1820973C - Device for identification of reason of automatic switch breaking off - Google Patents

Abstract

SUMMARY OF THE INVENTION: The availability of additional information that the circuit breaker has been disconnected from the short circuit allows the operator to conclude that it is necessary to send an emergency team to inspect the contact network at the beginning of the power section and not to turn on the circuit breaker. The presence of additional information that the circuit breaker was disconnected from overload allows the operator to conclude that there was a malfunction in the movement of the rolling stock. In this case, you can turn on the switch with confidence that the contact wire will not be annealed. The availability of additional information that the circuit breaker has been disconnected from the operation of the temporary protection allows the operator to conclude that it is necessary to send an emergency team to inspect the contact network at the end of the power supply section and not to turn on the circuit breaker. The device allows to extend the service life of the contacts of the circuit breaker, since there is no need for additional switches to find out what happened on the power supply. 1 ill. C / j s

Description

The invention relates to contact network protections, in particular to tram and trolley contact network protections.

The purpose of the invention is to reduce the time for correct actions by the operator of remote-controlled substations to eliminate the accident on the contact network of the tram and trolley bus by increasing the amount of information about the reason for the circuit breaker tripping, namely the recognition that the trip was due to overload or short circuit or operation of the device for long-term protection.

The drawing shows a functional diagram of the device.

The device for recognizing the reason for opening the circuit breaker contains a current sensor 1, to which the input of amplifier 2 and the input of the first start-up block 3 are connected. The input of differentiating element 4 is connected to the output 2 of amplifier 2. The input of pulse amplifier 5 is connected to the output of differentiating element 4. The information input of the second starting block 6 is connected to the first output of the pulse amplifier 5, the information input of the third starting is connected to the second output of the pulse amplifier 5

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block 7. The output of the second launch block b is connected to the input S of the first trigger trigger 8. The output of the second trigger trigger 8 is connected to the input of the second actuator block with alarm 9, the input of the element And 10 is connected to the output Q of the first trigger of the trigger 8. The output of the element And 10 connected to the input of the third actuator, block with alarm 11. The output of the third starting block 7 is connected to input 0 of the second trigger trigger 11. To the output Q of the second trigger trigger 11 connected to the input of the element And 10 and the input of the element OR 12. The output of the element OR 12 is connected to the input an ode to V of the time sensor 13. The output of the first start-up block 3 is connected to the input of the third start-up trigger 14. The input Q of the third start-up trigger 14 is connected to the input of the OR element 12 and the input of the first execution unit with alarm 15. The output Q of the third start-up trigger 14 is connected the input V of the third starting block 7 and the input of the second starting block 6. The output of the time sensor 13 is connected to the input of the zero setting unit 16. The output of the zero setting 16 is connected to the input of the time setting 13, input R of the third trigger 12, input R of the second trigger and run 11 and the R input of the first trigger run 8. The apparatus also comprises a third actuating unit 17 with the alarm.

Current sensor 1 is a shunt included in a protected contact network feeder. A voltage divider is installed at the input of the amplifier, allowing it to be connected to shunts for different rated currents. As an amplifier 2, a current mirror circuit is used. As a differentiating element 3, an RC circuit is used. A regulator is installed at the input of the pulse amplifier 4, which makes it possible to set the required signal levels at the input, depending on the switch setting current. At the first output of the amplifier, the pulse level is lower than at the second, since the third starting block 7 should operate from a lower level, and the second starting block 6 from a higher level.

The second starting block 6 serves to start the first trigger 8 when the circuit breaker is disconnected from the short circuit and is made on a Schmitt trigger with an enable input. The third start-up block 7 serves to start the second start-up trigger when the overload outflow circuit breaker is turned off and is executed on a Schmitt trigger with an enable input. The first start-up unit 3 serves to start the third start-up trigger when the circuit breaker is tripped by a current-protective device, which is part of the circuit-breaker control circuit.

The first trigger trigger 8 is made on the RS-trigger and serves to trigger the second

actuator unit 9 to prohibit the operation of the third actuator unit 17 when the circuit breaker is disconnected from short circuit currents.

The second start trigger 11 on the RHF-trigger serves to start the time setter OUT when the circuit breaker is disconnected from the short-circuit currents and overload, and also to start the third actuating unit 17 when the circuit breaker is disconnected from overload.

5 The third trigger trigger 14 is made on the RS-trigger. Serves to start the first actuator block 15 and the time setter 13, and also provides a prohibition of the second start-up block 6 and the third

0 of the start-up block 7 when the breaker circuit breaker trips.

The time dial 13 is used to delay the operating time of the Executive units, depending on what happened

5, tripping the circuit breaker for a time sufficient to transmit a signal via the tele-signaling system and issue a command to the zeroing unit 16 for resetting the device after each

0 actuation cycle. The time dial 13 consists of a clock generator with enable input and a binary counter.

The zeroing block 16 serves to

5 to reset the device both when power is applied and at the end of each operation cycle.

The device operates as follows.

0 When the protected network is turned on, the signal from the current sensor 1, proportional to the current value in the contact wire, is fed to the input of amplifier 2 and the input of the first start-up block 3.

5 The signal amplified by the amplifier 2 is fed to the input of the differentiating element 4 and then amplified by a pulse amplifier 5. In normal operation of the contact network at the first and second outputs

0 pulse amplifier 5, the signal level is such that the second launch block 6 or the third launch block 7 does not start.

If a switch-off of the 5 bodies from overload has occurred, the signal value will change abruptly from the steady-state value at overload current to zero. At the second output of the pulse amplifier 5, there will be a signal sufficient to start the third starting block 7, but not enough to start

second start-up block 6. From the output of the third start-up block 7, a signal will be sent to the second start-up trigger 11. In the initial state, the output Q of the first start-up trigger 8 is a logical unit and the output Q of the second start-up trigger 11 will be set to a logical unit as a result of the pulse, therefore the output of the And 10 element receives a signal to activate the third actuating unit 17, - signaling that the circuit breaker has tripped from overload. From the second trigger trigger 11 through the input of the element OR 12 received the trigger signal time dial 13, which with a time delay of 5 to 20 s (depending on the type of telesignal) sends a signal to the zero setting unit 16. The zero setting unit 16 will set the element 8, 11, 14, 13 to the initial states, and the execution unit 17 is turned off.

If the circuit breaker is disconnected from the short circuit, the signal value will change abruptly from the steady state value at the short circuit current to zero. At the second and first outputs of the pulse amplifier 5, there will be a signal sufficient to start the third trigger 7 and the second trigger 6. From the output of the second trigger 6, the signal will go to the first trigger 8. At the output Q of trigger 8, the logic unit will work, it will work a second actuator unit 9, signaling that a short circuit outflow switch has been tripped.

The output Q will be a logical zero, prohibiting work on the input of the And element 10. The start of the timer 13 and the initialization will occur in the first case, the elements 7, 11, 12, 13, 16 will work. At the end of the cycle, the second executive block 9.

If the current is kept in the contact network for a longer time than the setpoint current of the switch, but sufficient to anneal the contact wire, the switch will be switched off by the device for the temporary protection of the contact network serving as the first trigger unit 3. The signal from the output of the first trigger unit 3 will go to the third trigger start 14. At the output Q of the third trigger trigger 14 the logic unit is activated, the first executive unit 15 will operate, signaling that the circuit breaker has disconnected from the current protection to ntact network. Time ORDER 13 will start via OR 12. The output of the third start-up trigger 14 5 will be a logic zero, which prohibits the operation of the third start-up block 7 and the second start-up block 6 in case the currents close to the breaker set currents are cut off by current protection. This excludes

0 false operation of the second actuator unit 9 and the third actuator unit 17. With a delay of time, the time dial 17, through the zeroing unit 16, will reset the device.

5 At the end of the cycle, the actuation unit 15 is turned off.

Claims (1)

SUMMARY OF THE INVENTION A device for recognizing a reason for opening a circuit breaker, 0 containing a current sensor, the output of which is connected to the first start-up unit, the first executive unit with an alarm system, characterized in that additionally introduced are serially connected amplifier, a differentiating element and a pulse amplifier, a second and third start-up units, three start triggers, AND, OR elements , time clock, installation block in O, second and third actuating units 0 with alarm, while the input of the amplifier is connected to the output of the current sensor, the first output of the pulse amplifier is connected in series through the second starting block and the first trigger is connected to 5 to the input of the second executive unit with alarm, the second output of the pulse amplifier through the third start block and the second trigger is connected to the first inputs of the AND and OR elements, the second output of the first trigger is connected to the second input of the AND element, the output of which is connected to the input of the third executive unit with alarm, first launcher output 5 blocks through the third trigger trigger is connected to the second input of the OR element and the input of the first Executive unit with alarm, the output of the OR element through the time dial is connected to the input of the block 0 set to O, the output of which is connected to. installation inputs of trigger triggers and the second input of the time setter, the second output of the third trigger trigger is connected to the enable inputs of the second and third 5 starting blocks.